JP2547203Y2 - Sheet pallet gripper for cargo handling vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for gripping a sheet pallet on which a non-standard or lightweight fixed object such as a bag-like load is placed in a cargo-handling vehicle such as a forklift truck.

[0002]

2. Description of the Related Art In a forklift truck, two forks are attached to an elevating mast at the front of a vehicle, and a fork is inserted into a wooden pallet on which a heavy object is placed, and the fork is lifted, lowered, and transported. Although it is a basic function, it uses various attachments in consideration of properties such as the shape, weight, and the like of an object to be conveyed, so that a lifting operation and a conveying operation are efficiently performed.

For example, bags containing rice grains and the like, cement bags, and the like are relatively small in weight and can be stacked in an irregular shape, so that they are placed on a wide thin plate called a sheet pallet, and a push-pull device is used. (Attachment) is often used. That is, the edge of the sheet pallet on which the bag is placed is gripped by the gripping device of the push-pull device, pulled on the platen, lifted, or moved to another location. When unloading the bag from the sheet pallet, the bag is pushed out only by the push-pull device while the sheet pallet is pulled in and gripped.

[0006] When storing bag-like luggage placed on a sheet pallet in a stacked manner, it is performed as shown in FIG. That is, in FIG. 6, the sheet pallet S on which the load W is placed
Are sequentially stacked by the forklift truck FL. That is, the end portion of the sheet pallet S is gripped and handled by the push-pull device PP mounted on the mast of the forklift truck FL.
Is pulled and dropped, or is not grasped when it should be pulled. However, in a state where the sheet pallets S are stacked in several stages, if the distance between the sheet pallets S to be gripped and the operator of the forklift truck FL increases,
It is quite difficult to visually recognize the grip of the sheet pallet S.

The applicant of the present invention has made an improvement to make it easier to confirm the holding of the sheet pallet in the mounting for holding the sheet pallet as described above.
No. filed. This improved structure will be described with reference to FIG. 7. The gripper jaw 3 hanging from the lower end of the face plate FP at the front end of the push-pull device PP cooperates with the gripper 5 approaching and separating from the sheet pallet. Hold the end of S. A visual hole 7 is formed in the lower inclined portion of the gripper jaw 3, and the gripper 5 is aligned with the visual hole 7.
The notification pin 9 is penetrated at the position. In this structure, trying to sandwich the sheet pallet S (Fig. 6)
When the gripper 5 is lowered to approach the gripper jaw 3, if the sheet pallet S is at a position where the sheet pallet S is accurately sandwiched, the notification pin 9 does not enter the visual recognition hole 7 and the operator cannot see the notification pin 9. If the sheet pallet S does not enter the correct position, the notification pin 9 enters the viewing hole 7 and hangs out to be visually recognized by the operator. That is, by observing whether or not the notification pin 9 protrudes from the viewing hole 7, the state of the sandwiching of the sheet pallet S is determined.

[0006]

As described above, when judging the sandwiching state of the sheet pallet, when the sheet pallet is handled at a high position, the notification pin and the operator may be far apart, making it difficult to visually recognize the notification pin. Many. In particular, such work is often performed in warehouses and the like, and the lighting is not sufficient.Also, even if there is lighting, it is easily shaded because it is from the ceiling, so it is quite difficult to see the notice pin. Becomes

Further, the notification pin has an appropriate size, and the notification pin does not enter the viewing hole and does not protrude even if the sheet pallet is merely applied to the side edge of the notification pin. That is, even when the pin is not held sufficiently, the notification pin does not protrude, and it may be determined that the pinching is sufficient.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet pallet gripping device in a cargo-handling work vehicle equipped with a push-pull device, which can easily visually recognize and judge the holding and the amount of the sheet pallet.

[0009]

According to the first aspect of the present invention, there is provided a holder mounted on a mast of a loading and unloading vehicle such that the holder can move up and down, and one end is provided at a lower end of the holder. A loader working vehicle having a platen fixed and extending in a horizontal state toward the front of the cargo handling vehicle, and a push-pull device provided on the holder and moving along the upper surface of the platen. A sheet pallet gripping device provided below the front end face plate includes a gripper jaw suspended and fixed at a lower end, and a gripper approaching and separating from the gripper jaw from above, and a light source lamp is embedded in the gripper. In addition, a visual through hole is formed at a position of the gripper jaw aligned with the light source lamp. According to the second aspect of the present invention, a plurality of light source lamps are embedded in the gripper so as to be separated from each other in the forward and backward directions of the push-pull device. Drilling holes.

[0010]

[Operation] When the cargo handling vehicle is operated, first approach the sheet pallet on which the load to be handled is placed, further push the pull-pull device close to the load, and place the sheet pallet between the gripper jaw and the gripper of the sheet pallet holding device. So that the gripping end comes. Then, the gripper is moved closer to the gripper jaw to grasp the edge of the sheet pallet and perform a required operation. When the sheet pallet comes to the correct position and blocks the light of the light source lamp in the gripper, no light is emitted from the through hole. If the sheet pallet completely overlaps the visible through hole, the light of the light source lamp is substantially completely blocked as described above, and if the sheet pallet partially overlaps,
A part of the light beam is blocked, and a small amount of light leaks from the visual through hole. When a plurality of light source lamps are used, the light beam is blocked in the same manner, but when only the light beam from the light source lamp in front is blocked by the sheet pallet, the amount of grip at the end of the sheet pallet is reduced. Is set so that the sheet pallet does not go too far into the back.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference characters.

FIG. 1 shows a loading / unloading truck or forklift truck 1 to which the present invention is applied.
Is shown. A lift bracket 4 is attached to a telescopic lifting mast 2 at the front of the forklift truck 1. A lift bracket 4 that moves up and down along the mast 2 supports a vertical holder 8 via a finger bar 6. A rear end of a platen (wide fork) 10 is connected to a lower end of the holder 8, and extends forward in a horizontal state. Platen 10 is a mast 2
And / or the lift bracket 4 is moved up and down as the lift bracket 4 moves up and down.

A push-pull device 20 is mounted on the holder 8. The push-pull device 20 mainly includes a lifting frame 21, a retainer cylinder 22, a retainer 23 fixed to a lower end of the lifting frame 21, a pantograph 26, a push-pull cylinder 27, a face plate 28, a gripper jaw 29, a gripper 30 and a gripper cylinder 31. And so on. Pantograph 2
Reference numeral 6 denotes a link mechanism as shown, which expands and contracts in the horizontal direction by expansion and contraction of a push-pull cylinder 27, and pushes out (pushes) the face plate 28 forward, or holds the sheet held between the gripper jaw 29 and the gripper 30. Pull the pallet toward you. As is apparent from the above, the gripper jaw 29, the gripper 30, and the gripper cylinder 31
Form a gripping device for the sheet pallet.

FIG. 2 shows an enlarged detail of a sheet pallet gripping device incorporating the features of the present invention. 1 and 2, a gripper jaw 29 suspended and fixed to the lower end of the face plate 28 has an inclined plate portion 29a at the lower end.
, Through which a visible through hole 29b is formed. The gripper 30 fixed to the tip of the piston rod of the gripper cylinder 31 is provided with a pad 30a of hard rubber or the like, and a light source lamp 33 is embedded therein. As is apparent from the figure, the light source lamps 33 are aligned with the visible through holes 29b, and although not shown, the light source lamps 33 and the visible through holes 29b are preferably separated by two in the vehicle width direction. Although provided, one set or three or more sets may be provided. As will be understood from the description below, if a plurality of sets are provided, when the holding amount of the sheet pallet in the vehicle width direction is different, a visible through hole that blocks light and a visible through hole that does not block appear, so that the baggage is oblique. Can be avoided.

The face plate 28 is provided with a sensing switch 35 for sensing the extension of the pantograph 26, and is connected to the light source lamp 33 as shown in FIG. In this embodiment, the sensing switch 35 is operated by the pantograph 26, but the face plate 28
If the member moves in response to the approach of the load, or vice versa, the detection switch 35 can be operated by the member.
The power source 37 may be a specially provided battery or a generator or battery of the engine of the forklift truck 1.

Referring to FIGS. 1 to 3, when the pantograph 26 is folded by the push-pull cylinder 27, the link bar 26a of the pantograph 26 comes to the position indicated by the two-dot chain line in FIG. Open the circuit shown in FIG. In this state, the light source lamp 33 does not light up, and conversely, the pantograph 2
When 6 is extended, the gripping device can clamp the sheet pallet, and the sensing switch 35 closes the circuit of FIG. By doing so, the light source lamp 33 is turned on.

With the light source lamp 33 turned on, the push-pull device 20 or the forklift truck 1 is operated, and the sheet pallet is moved to the light source lamp 33 and the visible through hole 29.
b, the light from the light source lamp 33 is substantially completely blocked, and no light can be seen from the visible through hole 29b. In this state, it is determined that the sheet pallet is sufficiently held, and the gripper cylinder 31 is extended to hold the sheet pallet. Furthermore, if the push-pull cylinder 27 of the push-pull device 20 is shortened, the sheet pallet on which the load is placed can be slid over the platen 10 and pulled in.

On the other hand, if the light is completely visible from the visual through hole 29b, or if there is any light even if weak, the end of the sheet pallet is not at the inner position to be clamped or the clamping amount is insufficient. Is determined.

In the above embodiment, one light source lamp 33 is used at each location. However, as shown in FIGS. 4 and 5, a plurality of light source lamps, for example, a red light source lamp 133a and a green light source lamp 133b are used. Preferably, two visible through holes 129b, 129c may be formed in the lower end inclined portion 129a of the jaw 129 in alignment with these lamps. Red light source lamp 133a, green light source lamp 133b
The connection state of the sensing switch 35 is as shown in the circuit diagram of FIG. 5, and the same function as that of FIG. 4 is obtained. It should be noted that only one visible through hole may be used on one side and may be common to each light source lamp.

In this modified embodiment, if the sheet pallet is not located at the position where the sheet pallet is held, red light can be seen from the visible through hole 129b (green light can also be seen). Is visible through hole 1
29b and 129c are blocked, and no light can be visually recognized. When the holding amount of the edge of the sheet pallet becomes appropriate, the sheet pallet blocks only the visible through hole 129b, does not show red light, and only the green light passes through the visible through hole 129.
You can see from c. That is, when only green light is seen, it is determined that the sheet pallet is properly held, and the next operation is performed.

[0021]

As described above, according to the present invention, if a predetermined light can be visually recognized in the visible through hole of the gripper jaw at the lower front end of the push-pull device, it can be determined that the sheet pallet is properly held. Since the light can be clearly and easily confirmed even from a distance, proper clamping of the sheet pallet can be ensured quickly and easily.

[Brief description of the drawings]

FIG. 1 is an overall view of a forklift truck to which the present invention is applied.

FIG. 2 is a partially enlarged view showing a main part of the embodiment of the present invention.

FIG. 3 is an electrical circuit diagram that forms part of the embodiment of FIG.

FIG. 4 is a partially enlarged view showing a main part of another embodiment of the present invention.

FIG. 5 is an electrical circuit diagram forming part of another embodiment of FIG.

FIG. 6 is a work explanatory diagram illustrating functions of a conventional device.

FIG. 7 is a partially enlarged sectional view showing the structure of a conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Forklift truck (loading work vehicle), 8 ... Holder, 10 ... Platen, 20 ... Push-pull device, 28 ...
Face plate, 29: gripper jaw, 29b: visible through hole, 30: gripper, 33: light source lamp, 35 ...
Sensing switch, 129: gripper jaw, 129b: visible through hole, 129c: visible through hole, 130: gripper,
133a: red light source lamp, 133b: green light source lamp, S: sheet pallet.

Claims (2)

(57) [Scope of request for utility model registration] 1. A holder attached to a mast of a loading and unloading vehicle so as to be able to move up and down, a platen having one end fixed to a lower end of the holder and extending in a horizontal state toward the front of the loading and unloading vehicle. A loading / unloading vehicle having a push-pull device provided for advancing and retreating along the upper surface of the platen; a gripper jaw suspended and fixed to a lower portion of a face plate at a front end of the push-pull device; and a gripper jaw approaching from above. A gripper having a light source lamp buried therein, and a visible through hole formed in the gripper jaw corresponding to the light source lamp. apparatus. 2. A holder attached to a mast of a cargo handling vehicle so as to be able to move up and down, a platen having one end fixed to a lower end of the holder and extending horizontally toward the front of the cargo handling vehicle; A loading / unloading vehicle having a push-pull device provided for advancing and retreating along the upper surface of the platen; a gripper jaw suspended and fixed to a lower portion of a face plate at a front end of the push-pull device; and a gripper jaw approaching from above. A plurality of light source lamps are embedded in the gripper so as to be separated from each other in a forward and backward direction of the push-pull device, and a visual through hole is formed in the gripper jaw corresponding to the light source lamp. A sheet pallet gripping device for a cargo-handling work vehicle, comprising: